Enhancement: Restore auto-merge of dependabot pull requests

[localheinz]

This pull request

• restores the auto-merge of dependabot pull requests

Follows ergebnis/php-package-template#759.

[codecov]

Codecov Report

Merging #96 (6eb573a) into main (70c1b96) will not change coverage.
The diff coverage is n/a.

❗ Current head 6eb573a differs from pull request most recent head 9db92a4. Consider uploading reports for the commit 9db92a4 to get more accurate results

@@            Coverage Diff            @@
##               main      #96   +/-   ##
=========================================
  Coverage     97.89%   97.89%           
  Complexity       38       38           
=========================================
  Files             9        9           
  Lines            95       95           
=========================================
  Hits             93       93           
  Misses            2        2           

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